Tool holder



J. M. LUERS TOOL HOLDER Filed May 29 1959 INVENTOR.

Patented Dec. 3, 1940 PATENT OFFICE TOOL HOLDER John M. Luers, Chesterfield Township, Macomb County, Mich.

. Applicaticn May 29, 1939, Serial No. 276,386

4 Claims. (01. 29-96) This invention relates to improvements in tool holders, and refers particularly to tool holders for cutting-off tools.

It is an object of this invention to provide a tool holder for cutting-off, or parting, tools which afford a maximum amount of rigidity, and Whereby the tool is so supported that the overhang of the tool beyond its support is substantially no greater than the radius of the work. Thus the tool and tool holder together form a unit substantially as strong as a forged one-piece tool.

'Another object of the invention is to provide a tool holder into and from which the tool may be quickly and easily inserted or removed, and wherein upon each replacement of the tool the latter must assume its correct position relative to the work after theholder has once been set, so that the only requirement is to see that the tool projects approximately the required outward 2 distance from the holder.

Having thus stated some of the objects and purposes of the invention I will now describe it with the aid of the accompanying drawing, in which:

Figure 1 illustrates a side elevation of the invention, and v Figure 2 is an end view thereof.

Figure 3 is a detail showing one of the rollers.

Figure 4 is a side elevation showing a slightly modified construction, and I Figure 5 is an end view thereof.

Referring to the drawing, 1 designates a unitary holder having a recess 2 formed longitudinally in one side thereof intermediately of its 5 height. The base 3 of this recess, longitudinally of which a central depression 4 is preferably formed, constitutes a seat against which one side of a parting tool 5 rests throughout the major portion of its length. One side or wall 6 of the recess forms a longitudinal bearing surface for the top or outer edge face of the cutting head I-of the tool. This head 1, in the present instance projects laterally on both sides of the tool body 5a and one side of the head lies in a longitudinal cavity 2a formed in the base of the recess 2. The side or wall 8 of the recess opposite the wall 6 is spaced beneath the lower side of the tool body 5a.

A portion of the forward extremity of the holder I is curved in form as shown at 9. The top or outer edge face of the cutting head 1 which is fed radially into the work A must extend along a line radial to the work axis, or substantially so, in order to cut satisfactorily, consequently the wall 6 of the recess must also be substantially radial to the work axis 1). The curved portion 9 is thereforedescribed about the axis 12 in alignment with the said side 6 produced. The length of the radius about which this curve 9 is described should be only very slightly greater 5 thanthat of the work A on which the tool carrier by the holderl is intended to operate. Thus the overhang of the blade 5 is reduced to aminimum, andthe lower forwardly projecting portion. I 0 of the holder provides stock wherein suit- 10 able means are provided for forcing th blade or tool 5 into engagement with the side or wall 6 of the recess 2 primarily across a line 0 just rearwardly of the work A when the cut therein is completed and at right angles to the bearing face of the wall 6. In other words the overhang of the tool 5 from its clamping line 0 is also reduced to a minimum. l

The means shown in Figures 1, 2 and 3 for forcing the tool 5 into engagement with the wall 20 or side 6 consists in the provision of a roller [5 mounted transversely of the holder l and having its axis on the line 0. On the portion of the roller l5 extending beneath the tool 5 a cam I6 is formed thereon so that by rotation of the roller 25 IS the said cam may be turned to force the blade 5 into intimate contact with side or wall 6. To facilitate rotation of the roller [5 a multi-sided aperture I1 is formed in one extremity thereof to receive a suitable wrench. 3o

-Rearwardly of the roller 15 and spaced therefrom a second and similar roller l5a is also provided in the holder I having a cam |6a thereon which also engages the underside of the tool 5 and similarly may be turned to force th tool 35 against the side or wall 6. By this second cam lua the tool is held against any possible rocking movement on the cam l6 that might otherwise occur. a

The rollers l8 and Mia have peripheral grooves 19 and I; respectively formed therearound intermediately of their length through which a pin it extends which is in threaded engagement with the holder l. Thus provision is made for holding the said rollers against axial movement. 45

In the modification shown in Figures 4 and 5, screws 25 and 25a are provided in threaded engagement with the holder I, the former of which lies on the line 0, by which pressure is exerted against the underside of the blade 5 to force the 50 top or outer edge face of the cutting head 1 into intimate contact with the side or wall 6 of the holder.

While in the foregoing the preferred embodiments of the invention have been described and 55 shown it is understood that further modifications may be made provided they fall within the scope of the appended claims.

I claim:

1. A tool holder having a longitudinal recess formed in one side thereof against the base of which one side of a tool having a cutting head along one longitudinal margin is adapted to rest, one wall of said recess forming a bearing surface against which the outer edge face of the cutting head is adapted to be held, one extremity of the holder extending forwardly beneath and beyond the bearing surface, a roller mounted transversely in the holder so positioned that an imaginary line drawn from the forward extremity of the bearing surface and at right angles thereto passes substantially through its axis, a cam on said roll-er to engage the underside of the tool and force its head against said bearing surface, and a second supporting means mounted in the holder inwardly of said roller, said means also being adapted to exert pressure against the tool and hold the head of the latter against the bearing surface.

2. A tool holder comprising the combination set forth in claim 1, wherein the second supporting means consists of a second roller parallel with the first roller and also having a cam thereon to engage the tool, and. means in the holder engaging both rollers and holding them against axial movement.

3. A tool holder having a recess formed longitudinally in one side thereof against the base of which one side of a tool having a cutting head along one longitudinal. margin is adapted to rest, one wall of the recess forming a bearing surface against which the outer edge face of the cutting head is adapted to be secured, one extremity of the holder being downwardly and outwardly curved across the recess from said wall, the axis of the curve lying substantially upon an imaginary line extended forwardly in the said plane as said wall, a roller mounted transversely in the holder so positioned that a line drawn from the forward extremity of the bearing surface and at right angles thereto passes substantially through its axis, a cam on said roller to engage the underside of the tool and force its head against said bearing surface, a second roller parallel with the first roller and spaced rearwardly therefrom, a cam on the second roller also to engage the underside of the tool, and means in the holder engaging both rollers and holding them against axial movement.

4. A tool holder having a longitudinal recess formed in one side thereof against the base of which one side of a tool having a cutting head along one longitudinal margin is adapted. to rest, one wall of said recess forming a bearing surface against which the outer edge face of the cutter head is adapted to be held, one extremity of the holder extending forwardly beneath and beyond the bearing surface, a clamping member mounted transversely in the holder so positioned that an imaginary line drawn from the forward extremity of the bearing surface and at right angles thereto passes substantially through the axis of said member, the latter being adapted to engage the underside of the tool and force its head against the bearing surface, and a second supporting means mounted in the holder inwardly of the clamping, means, said second supporting means also being adapted to exert pressure against the tool and hold the head of the latter against said bearing surface.

JOHN M. LUERS. 

